U.S. Air Force Academy 4-m telescope

U.S. Naval Observatory's Programs to Determine Accurate Proper Motions of Faint Stars

Ubiquity of optical activity in planar metamaterial scatterers

UBV and UVBY photometry of the magnetic CP star 56 ARIETIS - 1990 and 1991

UBV photometry of SGP AGNs (La Franca+, 1999)

UBV photometry of SN 1987A - Earliest photoelectric observations

UBV photometry of stars whose positions are accurately known.

UBV photometry of Vesta

UBVRI photometry of SN 1993J in M81: The first 120 days

UCLA 3-color infrared speckle photometer

UHV aluminum grazing incidence reflectance at extreme ultraviolet wavelengths

UKIRT 5-axis Tip-Tilt Secondary - Electromechanical and Optical Design

UKIRT 5-Axis Tip-Tilt Secondary - Wavefront Sensor Simulations

UKIRT newsletter

ULE - Zero expansion, low density, and dimensionally stable material for lightweight optical systems

ULTIMA free-flying large-aperture space telescope [3126-23]

Ultimate fast optical switching of a planar microcavity in the telecom wavelength range

Ultimate test results on the active optics system of the Galileo Telescope

Ultra Fast Nonlinear Optical Tuning of Photonic Crystal Cavities

Ultra Fine Measurement of the Effect of a Vacuum Exposure on the Central Wavelength of Narrow-Bandpass Interference Filters Manufactured by Dual Ion Beam Sputtering